python-import

问题 To preface, I think I may have figured out how to get this code working (based on Changing module variables after import), but my question is really about why the following behavior occurs so I can understand what to not do in the future. I have three files. The first is mod1.py: # mod1.py import mod2 var1A = None def func1A(): global var1 var1 = 'A' mod2.func2() def func1B(): global var1 print var1 if __name__ == '__main__': func1A() Next I have mod2.py: # mod2.py import mod1 def func2():

问题 Say we want to import a script dynamically, i.e. the name is constructed at runtime. I use this to detect plugin scripts for some program, so the script may not be there and the import may fail. from importlib import import_module # ... subpackage_name = 'some' + dynamic() + 'string' try: subpackage = import_module(subpackage_name) except ImportError: print('No script found') How can we make sure to only catch the possible import failure of the plugin script itself, and not of the imports

问题 Let's say that we have python packages package_a and package_b . As a user, I want to be able to say: from package_a.package_b import some_functionality My question is: is there a way to support this without literally copy-pasting the code of package_b to package_a ? EDIT 1: To clarify, I have shadow naming (my python package is named the same way as my folder), and I am wondering if there was a way to make the python package available somewhere else. And yes, I'm looking into ways how to

问题 I have two .py scripts. script1.py and script2.py I am importing few variables from script2.py like: from script2 import variable1 as var1 which works fine. But when I update variable1 in script2.py , and then re-run script1.py , the update of variable1 doesn't show up in script1.py . Why is that so? The update of variable1 shows up if I close IPython completely and then re-open IPython again. But I don't want to do this all the time as I need few plot's to be open. I am using IPython 1.2.1

问题 I'm trying to write my first Python package, and almost all my modules will need to use NumPy. Should I write import numpy in every single module or is there some place in the package I can just import it once so every module can use it? What's the best way to do this? 回答1: Yes, just import it everywhere it's needed. Don't get too clever with writing functions that import everything for you or metamodules that import things and from which you import * ; all of that only serves to make your

问题 Here is where I checked the performance of __import__() In [9]: %%timeit ...: math = __import__('math') ...: sqrt = math.sqrt ...: sqrt(7894561230) ...: The slowest run took 11.16 times longer than the fastest. This could mean that an intermediate result is being cached. 1000000 loops, best of 3: 534 ns per loop In [10]: %%timeit ...: from math import sqrt ...: sqrt(7894561230) ...: ...: The slowest run took 10.23 times longer than the fastest. This could mean that an intermediate result is

问题 Here is where I checked the performance of __import__() In [9]: %%timeit ...: math = __import__('math') ...: sqrt = math.sqrt ...: sqrt(7894561230) ...: The slowest run took 11.16 times longer than the fastest. This could mean that an intermediate result is being cached. 1000000 loops, best of 3: 534 ns per loop In [10]: %%timeit ...: from math import sqrt ...: sqrt(7894561230) ...: ...: The slowest run took 10.23 times longer than the fastest. This could mean that an intermediate result is

问题 Can you help me how can i delete all the files under the Windows/Temp files?? Below are my scripts but it doesn't work at all. import os import subprocess recPath = 'C:\\Windows\\Temp' ls = [] if os.path.exists(recPath): for i in os.listdir(recPath): ls.append(os.path.join(recPath, i)) else: print 'Please provide valid path!' paths = ' '.join(ls) pObj = subprocess.Popen('rmdir C:\\Windows\\Temp\\*.* /s /q *.*'+paths, shell=True, stdout = subprocess.PIPE, stderr= subprocess.PIPE) rTup = pObj

问题 I have a django project which I took it from github. I would like to run the project on my local using apache server. I have installed apache and want to run the project. But I am always getting this error. raise ImportError("Could not import settings '%s' (Is it on sys.path?): %s" % (self.SETTINGS_MODULE, e)) ImportError: Could not import settings 'core.settings' (Is it on sys.path?): No module named cms.models Please find the configuration I am using. Python 2.7 Django 1.4 database in

问题 I have a django project which I took it from github. I would like to run the project on my local using apache server. I have installed apache and want to run the project. But I am always getting this error. raise ImportError("Could not import settings '%s' (Is it on sys.path?): %s" % (self.SETTINGS_MODULE, e)) ImportError: Could not import settings 'core.settings' (Is it on sys.path?): No module named cms.models Please find the configuration I am using. Python 2.7 Django 1.4 database in